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Isolation of HPS from the load frame
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Operation of HPS
The HPS is operated by controls on the front panel of frame base and the user control panel, and by
functions within the controlling software. Methods to start and stop the HPS are provided in Table 9 on
page 29, “Run a test” on page 57 and “Shut down the system” on page 59.
When the HPS is on, the hydraulic cylinder should be positioned so that the piston is neither fully
retracted nor fully extended. When the hydraulic cylinder is in either of these conditions, it is difficult for
the 59 Series controls to maintain the position and the servo loop control could build up enough error to
shut down the HPS.
Isolation of HPS from the load frame
There may be some testing applications where it is desirable to isolate the Hydraulic Power Supply from
the load frame. Examples would be applications where the testing is sensitive to vibration.
The following procedures isolate the HPS; the HPS rests directly on the floor and is no longer attached to
the load frame.
Procedure for 300DX frames
1. Power off the machine and disconnect the power cord.
2. Remove the rear and side panels from the base.
3. Using a 6 mm hex wrench, remove the mounting hardware (four black socket head cap screws from
the left and right of the machine (No. 1 in Figure 6).
4. Loosen the lock nuts around the 4 set screws (No. 2 in Figure 6) to allow the set screws to turn.
5. Using a 6 mm hex wrench, rotate the 4 set screws (No. 2 in Figure 6) to raise the HPS so that it is
clear of the frame mounting.
6. Using a 10 mm hex wrench, lower the leveling feet on the base of the HPS (No. 3 in Figure 6) so that
the HPS is supported on the leveling feet.
7. Check clearances all around the base of the HPS. If any part of it is in contact with the frame base,
use the set screws and leveling feet to make adjustments to avoid contact.
Figure 6. Location of screws on 300DX
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